users table contains a row
for each user who has connected to the MySQL server. For each
user name, the table counts the current and total number of
connections. The table size is autosized at server startup. To
set the table size explicitly, set the
system variable at server startup. To disable user statistics,
set this variable to 0.
users table has the following
columns. For a description of how the Performance Schema
maintains rows in this table, including the effect of
TRUNCATE TABLE, see
Section 21.9.8, “Performance Schema Connection Tables”.
The client user name for the connection, or
NULL for an internal thread or user
session that failed to authenticate.
The current number of connections for the user.
The total number of connections for the user.